Physical Sciences Grade 12 Paper 2 KZN March 2019 Memo

Downloaded from hlayiso.com education Department: Education PROVINCE OF KWAZULU-NATAL NATIONAL SENIOR CERTIFICATE GRADE 12 Pe Aeleialeiaiaieieieieiaiaieieialeieiaiaioieisialaieieisiaieieiaieisieisisioisisieieieieieiely . PHYSICAL SCIENCES: CHEMISTRY (P2) ‘ COMMON TEST : | " ‘ i MARCH 2019 " | “See eee we MARKS : 50 TIME : 1HOUR This question paper consists of 6 pages and 2 data sheets. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 2 March 2019 Common Test NSC INSTRUCTIONS AND INFORMATION TO CANDIDATES 1. Write your name and cther information in the appropriate spaces on the ANSWER BOOK. 2. The question paper consists of FOUR questions. Answer ALL the questions in the ANSWER BOOK. 3. Start EACH question on a NEW page in the ANSWER BOOK. 4. Number the answers correctly according to the numbering system used in this question paper. 5. Leave one line between two sub-questions, for example between QUESTION 2.1 and QUESTION 2.2. 6. You may use a non-programmable pocket calculator. 7. You may use appropriate mathematical instruments. 8. You are advised to use the attached DATA SHEETS. 9. Show ALL formulae and substitutions in ALL calculations. 10. Round off your final numerical answers to a minimum of TWO decimal places where applicable. 11. Give brief motivations, discussions, et cetera where required. 12. Write neatly and legibly. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 3 March 2019 Commen Test NSC QUESTION 1: MULTIPLE - CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A - D) next to the question number (1.1. — 1.4) in the ANSWER BOOK, for example 1.5 D. 1.1. Which ONE of the following compounds represented below is an aldehyde? A CH3sCOOH B CHsCOCHs3 Cc CH3CH2CHO D CH3CH(OH)CH3 (2) 1.2 Boiling point is the .. . A temperature at which a liquid becomes a gas and is also called vapourisation point. B temperature at which a gas becomes a liquid and is also called condensation point Cc temperature at which a solid becomes a gas and is also called sublimation point D temperature at which the vapour pressure of a substance equals the atmospheric pressure. (2) 1.3. The structural formula of an organic compound is given below: j ; CH2CHs He Seen ee? ee ee OMg | ! | | H CHe H The correct IUPAC name for the above compound is. . . A 2,4 — dimethylhex — 1 — ene. B 3,5 — dimethylhex — 5 — ene. Cc 4 — ethyl — 2 — methylpent — 1 — ene. D 2 - ethyl — 4 — methylpent — 4 - ene. (2) 1.4. What are the reactants M and N in the following acid-catalysed reaction? H oO H | | | M + N — > H—C—O — C — C —H | | H H A Methanoic acid and ethanol. B Ethanoic acid and methanol. Cc Methanoic acid and methanol. D Ethanoic acid and propan — 2 - ol. (2) [8] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 4 March 2019 Common Test NSC QUESTION 2 (Start on a new page.) 2.1 Consider the following compound: H HH H—O—C—C— Cc —H l | H CH3 H 2.1.1. Name the functional group of the above compound. (1) 2.1.2 Write down the IUPAC name of the above compound. (2) 2.1.3. Write down a structural formula of an isomer of the above compound. (2) 2.2 Consider the following organic compound: H H H H H H H H | ik ia ik ee ee ae H i H HH HH HH 2.2.1 Write down the general formula of the homologous series to which this compound belongs. (2) 2.2.2 Using MOLECULAR FORMULAE, write down a balanced equation for the reaction of the above compound with excess oxygen. (3) 2.3. Achemical analysis of a compound, CnH2nO2, shows that it is made up of 12,5 % oxygen by mass . Calculate the percentage carbon in the compound. (5) 2.4 Polymers are organic compounds with a wide range of applications. The following compound represents a polymer formed as a result of addition polymerization: i C Cc | | H n 2.4.1. Write down the structural formula of a monomer for the above. (2) 2.4.2 Write down the IUPAC name of the above polymer. (2) [19] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 5 March 2019 Common Test NSC QUESTION 3 (Start on a new page.) An experiment was conducted to determine the boiling points of three(3) organic compounds, P, Q and R, from DIFFERENT HOMOLOGOUS SERIES under the same conditions. The following data was obtained: 3.1 3.2 3.3 3.4 3.5 Copyright Reserved COMPOUND BOILING POINT/G P 103 Q 137 R 163 Define the term homologous series. Formulate an investigative question for this experiment. Which ONE of the compounds P, Q or R has the highest vapour pressure? Refer to the data in the table to give a reason for the answer. The three organic compounds used in the experiment are CHa(CH2)3C H20H, CH3(CH2)2COOH and CH3(CH2)3CHO, in no specific order. 3.4.1. Which ONE of these compounds is represented by letter R? 3.4.2 Explain the answer to question 3.4.1 by referring to intermolecular forces and energy. How will the boiling point of pentane — 1,2 — diol compare to the boiling point of CHs3(CH2)3CH2OH? (Choose from GREATER THAN, LESS THAN or EQUAL TO) (2) (2) (1) (4) (1) [12] Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 6 March 2019 Common Test NSC QUESTION 4 (Start on a new page.) Three reactions of organic compounds are shown below: I: CH3CH2CHBrCH3s =——> X + NaBr heat I: H2SOa(conc.) +X = —> CH3sCHCHCHs + Y it tt Hl: Z + HCE ——» Ho oo oe 5~ § —H H oH Cc H 4.1. Compound X represents an alcohol. 4.1.1 Name the type of reaction represented by reaction I. (1) 4.1.2 List any TWO reaction conditions that must be satisfied for reaction I to take place. (2) 4.1.3 Write down the IUPAC name for compound X. (2) 4.2. Reaction Il is an elimination reaction. 4.2.1. Name the type of elimination reaction represented by reaction Il. (1) 4.2.2 Name the inorganic product Y. (1) 4.2.3 Is the organic product of this reaction a MAJOR or MINOR product? (1) 4.3 Inreaction Ill, an ALKENE Z is mixed with HCE. 4.3.1 Name this type of reaction. (1) 4.3.2 Explain why water must NOT be present in the reaction vessel. (2) [12] TOTAL MARKS: 50 Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 7 NSC March 2019 Common Test DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 2 (CHEMISTRY) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 2 (CHEMIE) TABLE 1: PHYSICAL CONSTANTSI/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Stomioontdrak p* 1,013 x 10° Pa Melee ceavolume By SYD Vn 22,4 dm?-mof" Standaanitonporatuar 1 273K Lady op clktron e 46x 10°C Avoyaato-konstante Na 6,02 x 10 mot" TABLE 2: FORMULAE/TABEL 2: FORMULES m N =e n=— na N, n m Vv c=— Sof =—- n=— v oro c MV Vv, Cae _ Na _ ‘ ov, My pH = -log[H30"] Kw = {H3O0°]J[OH] = 1 x 10 at/by 208 K 8 _ a 8 e fe e Feat = cathode ~ Eanoae TEs = Exatore — Esnoso orlof @ _pe 9 ® _poe 8 Eee = Ereauetion ~ Eoxidation ! Ese = Eradutsie ~ E casidasio orlof 8 C) 8 @ _ ee =e = E Sxaising agent ~ EE eaucing agent Eee = E orsideermiddel ~ Fe reduseermidde! Copyright Reserved Please Turn Over

panasay WBuAdog Downloaded from hlayiso.com TABLE 3: THE PERIODIC TABLE OF ELEMENTS TABEL 3: DIE PERIODIEKE TABEL VAN ELEMEN 1 2 3 4 5 6 7 8 9 100014 12 -130«14—C~CO*SS GTB (i) () (uy Vy) VI) ev) Atomic number - 1 KEY/SLEUTEL Atoomgetal 2 a H He 1 29 4 3 4 Electronegativity | ., Cu [Symbol 5 6 7 8 3 10 2 Li /2 Be Elektronegatiwiteit "| — 638 Simboot bed bt SNS $ Ne 7 9 , Wi} 12) 14) 16 | «19 | 20 11 12 t 3]; 14! 15 46! #17) «18 co Na|* Mg Approximate relative atomic mass 2AQ\|2 SiS P iS 2cCe!| Ar 23 24 Benaderde relatiewe atoommassa 27 28: 3 32, 35,5| 40 19 20 21 22] 23] 24] 25) 26] 27] 28] 29, 30| 31/ 32] 33] 34, 35| 36 s = Cal? Sc j2 Ti |Z V 2 Cr |2Mn2 Fe 2 Col? Ni |2 Cu/% Zn 2 Gal? Ge|S As|$ Sel3 Br} Kr 39 40 45 | 43 | 54 52| 55) 56) 59| 59| 635) 65 | 701 73| 75! 79| 80; 84 37 38 39] 40, 41° 427 43) 447 457) 46 | 477 48) #49) 50/51) 52/ 53! 54 3 Rbi2 Sr./> Zr) Nb/2 Moi? Te id Ruis Rh is Pd |2 Ag = Cd i= In |2 Sn|2 Sbis TelS | | Xe 86 88 89 | 91/1 92] 96 101} 103} 106] 108; 112] 115! 119/ 122) 128] 127/ 131 55 56 57 | 72; 73 | 74) 75| vel 77) 78] 79, 80) 811 82/ 831 84/ 65 | 86 S Csj$ Ba| La|2 Hf} Ta} W) Re| Os; Ir; Pt! Au! Hgi2 Te 2 Pb/2 Bi iS Pols At| Rn 133 | _137| 139! 179) 181] 184| 186] 190| 192] 195| 197; 201| 204} 207| 209 87 88 89 Lara 2 o Fries Ra Ac 58 | 59 | 6 | 61 | 62] 63 | 64 | 65 | 66 | G7 | 68 | 69 | 70 | 74 Ce | Pr | Nd | Pm/ Sm| Eu} Gd| Tb) Dy |} Hoj Er | Tm] Yb | Lu 140 | 141 | 144 150 | 152 | 157 | 159 | 163 | 168 | 167 | 169 | 173 | 178 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 107 | 102 | 103 Th | Pa | U | Np | Pu | Am|Cm)/ Bk} Cf | Es | Fm | Md | No} Lr 232 238 Zd ssouaios jealshud SSN g 188] UOWUWOD 610Z YE

Downloaded from hlayiso.com Physical Sciences P2 1 March 2019 Common Test NSC – Marking Guideline NATIONAL SENIOR CERTIFICATE GRADE 12 PHYSICAL SCIENCES: CHEMISTRY (P2) MARKING GUIDELINE COMMON TEST MARCH 2019 MARKS: 50 TIME: 1 hour This marking guideline consists of 5 pages. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 2 March 2019 Common Test NSC – Marking Guideline QUESTION 1 1.1 C  (2) 1.2 D (2) 1.3 A (2) 1.4 B (2) [8] QUESTION 2 2.1.1 Hydroxyl group  (1)  2.1.2 methylpropan - 1 - ol  Accept 2 – methylpropan - 1 - ol (2) 2.1.3 (Any One) NOTE: ● For any additional bond on the carbon atoms subtract 1 mark. ● If there are missing hydrogens subtract 1 mark. H H C H H H C C O H H H C H H H H H H │ │ │ │ H ―O― C― C― C ― C ― H │ │ │ │ H H H H H H H H │ │ │ │ H― C― C― C ― C ― H │ │ │ │ H O H H │ H  (2) Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 3 March 2019 Common Test NSC – Marking Guideline 2.2 2.2.1 CnH2n+2  (2) 2.2.2 2C8H18 + 25O2  16CO2 + 18H2O Reactants  / Products  / Balancing  If structural/condensed formula is used then 2/3 max. (3) 12,5 2.3 ( ) x M(CnH2nO2) = 32 100 Calc. molar mass of compound M(CnH2nO2) = 256 g.mol-1 Determining the value of n  Calc. % of C in whole comp.  But 12(n) + 2(n) = 256 - 32 n = 16 16 x 12  %C = ( ) x 100  256 = 75 %  (5) 2.4 2.4.1 H H C C H H (2) 2.4.2 polyethene (2) [19] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 4 March 2019 Common Test NSC – Marking Guideline QUESTION 3 3.1 A series of organic compounds that can be described by the same general formula  OR A series of organic compounds in which one member differs from the next by a -CH2 group. (2) 3.2 What is the relationship between boiling point and type of functional group?  (Accept any other correct investigative question as long as there is a relationship between boiling point and functional group.) (2) 3.3 P P has the lowest boiling point.  (2) 3.4 3.4.1 CH3(CH2)2COOH  (1) - 3.4.2 CH3(CH2)2COOH and CH3(CH2)3CH2OH have hydrogen bonding and CH3(CH2)CHO has no hydrogen bonding.  CH3(CH2)2COOH has TWO sites for hydrogen bonding.  The intermolecular forces between molecules of CH3(CH2)2COOH is therefore the strongest  and will require the most amount of energy to separate its molecule.  (4) 3.5 greater than  (1) [12] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences P2 5 March 2019 Common Test NSC – Marking Guideline QUESTION 4 4.1 4.1.1 substitution/hydrolysis  (1) 4.1.2 dissolve CH3CH2CHBrCH3 in ethanol/ethanol as a solvent  mild heat  dilute strong base/NaOH / KOH  (any 2) (2) 4.1.3 butan – 2 – ol  Accept 2-butanol (2) 4.2 4.2.1 dehydration  (1) 4.2.2 water  (1) 4.2.3 major product  (1) 4.3 4.3.1 addition/hydrohalogenation  (1) 4.3.2 Prevents the formation of an alcohol  (2) [11] TOTAL MARKS: [50] Copyright Reserved Please Turn Over